#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2018/12/9 12:18
# @Author  : lizhen
# @Site    : 
# @File    : math.py
# @Software: PyCharm


class CustomMath:
    def __pos__(self):
        pass

    def __neg__(self):
        pass

    def __abs__(self):
        pass
